/*
 * Copyright 2013-2019 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.springframework.data.elasticsearch.core.convert;

import java.util.Date;

import org.joda.time.DateTimeZone;
import org.joda.time.LocalDateTime;
import org.joda.time.ReadableInstant;
import org.joda.time.format.DateTimeFormatter;
import org.joda.time.format.ISODateTimeFormat;
import org.springframework.core.convert.converter.Converter;

/**
 * DateTimeConverters
 *
 * @author Rizwan Idrees
 * @author Mohsin Husen
 */
public final class DateTimeConverters {

	private static DateTimeFormatter formatter = ISODateTimeFormat.dateTime().withZone(DateTimeZone.UTC);

	public enum JodaDateTimeConverter implements Converter<ReadableInstant, String> {
		INSTANCE;

		@Override
		public String convert(ReadableInstant source) {
			if (source == null) {
				return null;
			}
			return formatter.print(source);
		}

	}

	public enum JodaLocalDateTimeConverter implements Converter<LocalDateTime, String> {
		INSTANCE;

		@Override
		public String convert(LocalDateTime source) {
			if (source == null) {
				return null;
			}
			return formatter.print(source.toDateTime(DateTimeZone.UTC));
		}

	}

	public enum JavaDateConverter implements Converter<Date, String> {
		INSTANCE;

		@Override
		public String convert(Date source) {
			if (source == null) {
				return null;
			}

			return formatter.print(source.getTime());
		}

	}
}
